2019 year born – age now in 2023?

How old am I in 2023 if I was born in 2019? Today's date is - 5 June 2023.

If year of birth - 2019, he is now:
3 years old or 4 years old*

*Depends on before or after 5 June 2019 year he was born.

If a person was born from January 1 2019 to 5 June 2019 inclusively, he is 4 years old now, otherwise, if after 5 June 2019 (until December 31 2019 inclusively), then he is still 3 years old now.

Other examples:

If 1909 year of birth - already 114 years or still 113 years.
If 1972 year of birth - already 51 years or still 50 years.
If 1991 year of birth - already 32 years or still 31 years.
If 2019 year of birth - already 4 years or still 3 years.

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